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AUSCERT External Security Bulletin Redistribution
5 October 2018
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Modify Arbitrary Files -- Unknown/Unspecified
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running AppArmor check for an updated version of the software for
their operating system.
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USN-3784-1: AppArmor update
4 October 2018
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 LTS
Use a more restrictive blacklist in several policy abstractions.
o apparmor - Linux security system
As a security improvement, this update adjusts the private-files abstraction to
disallow writing to thumbnailer configuration files. Additionally adjust the
private-files, private-files-strict and user-files abstractions to disallow
writes on parent directories of sensitive files.
The problem can be corrected by updating your system to the following package
Ubuntu 18.04 LTS
apparmor - 2.12-4ubuntu5.1
Ubuntu 16.04 LTS
apparmor - 2.10.95-0ubuntu2.10
Ubuntu 14.04 LTS
apparmor - 2.10.95-0ubuntu2.6~14.04.4
To update your system, please follow these instructions: https://
In general, a standard system update will make all the necessary changes.
o LP: 1788929
o LP: 1794848
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